活性炭氟烷基化及PVDF混合基质疏水膜研制  

Preparation and characterization of PVDF hybrid hydrophobic membrane doped fluoroalkyl-activated carbon

作　　者：孙学超[1,2,3] 武春瑞[1,2,3] 刘四华[1,3] 王中阳[1,2,3] 马忠[1,3] 王暄[1,3] 吕晓龙[1,2,3] 

机构地区：[1]天津工业大学省部共建分离膜与膜过程国家重点实验室,天津300387 [2]天津工业大学环境与化学工程学院,天津300387 [3]天津工业大学材料科学与工程学院生物化工研究所,天津300387

出　　处：《功能材料》2017年第7期7012-7016,7022,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51278336;51578376;21576210);天津市应用基础与前沿技术研究计划资助项目(15JCZDJC37500);教育部长江学者和创新团队发展计划资助项目(Grand no.IRI13084)

摘　　要：通过酸化-酯化反应,在活性炭(AC)微粒上接枝十二氟烷基,进而将其引入聚偏氟乙烯(PVDF)膜本体,制备PVDF/AC-DFH混合基质膜。研究了改性AC与PVDF相容性,以及对膜的疏水性和膜蒸馏性能的影响。结果表明,经过氟烷基化改性之后,AC与膜之间的相容性得到有效提升;混合基质膜的疏水性有明显提高,水接触角达到128.2°;当掺杂碳含量为0.15%(质量分数)时,混合基质膜的膜蒸馏通量达到41.4kg/(m^2·h),相比于掺杂未改性AC的PVDF/AC膜,提高了38.9%。The poor dispersion of the pristine activated carbon(AC)in membrane matrix impedes their performance in membrane distillation.In this work,the AC particles were functionalized by fluoroalkyl groups via the reaction between carboxylic activated carbons and dodecafluoroheptanol(DFH).High-flux hydrophobic membrane was prepared by simply blending poly(vinylidene fluoride)(PVDF)and functionalized AC-DFH particles via a conventional phase inversion method.The effect of modified AC on the compatibility of PVDF,hydrophobicity and distillation of membrane was investigated.The dispersion of inorganic particles in membrane matrix was improved obviously by fluoroalkyl groups.Furthermore,compared with the membrane with pristine AC particles,the PVDF/AC-DFH membrane exhibited satisfying hydrophobicity with contact angle of 128.2°.Membrane distillation flux of the membrane reached 41.4kg/(m^2·h)with doped carbon content of 0.15wt%.In comparison with PVDF/AC membrane,the flux of PVDF/AC-DFH membrane was improved 38.9%.

关 键 词：膜蒸馏 PVDF 活性炭 氟烷基化 十二氟庚醇 

分 类 号：TQ028.8[化学工程]